Mexican Beef and Rice Casserole is a hearty, flavorful dish featuring ground beef, rice, and a blend of Mexican cheeses. This easy one-pan recipe is perfect for busy weeknights, offering a satisfying combination of beef, spinach, corn, and fire-roasted tomatoes, all seasoned with taco spices. Serve it with a sprinkle of fresh cilantro for a vibrant, comforting meal.